Twilio incident

Voice Call Audio Quality Degradation between a Subset of Twilio United States Phone Numbers and T-Mobile in United States

Minor Resolved View vendor source →

Twilio experienced a minor incident on May 11, 2026 affecting Voice, North America, lasting 2d 5h. The incident has been resolved; the full update timeline is below.

Started
May 11, 2026, 04:04 PM UTC
Resolved
May 13, 2026, 09:11 PM UTC
Duration
2d 5h
Detected by Pingoru
May 11, 2026, 04:04 PM UTC

Affected components

Voice, North America

Update timeline

  1. investigating May 11, 2026, 04:04 PM UTC

    Twilio customers may be experiencing voice call audio quality degradation between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States. Our team is actively investigating this issue. We will provide another update in 1 hour or as soon as more information becomes available.

  2. identified May 11, 2026, 04:27 PM UTC

    Twilio customers may be experiencing voice call audio quality degradation between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 1 hour or as soon as more information becomes available.

  3. identified May 11, 2026, 05:30 PM UTC

    Twilio customers may be experiencing voice call audio quality degradation between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 2 hours or as soon as more information becomes available.

  4. identified May 11, 2026, 07:31 PM UTC

    Twilio customers may be experiencing voice call audio quality degradation between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 4 hours or as soon as more information becomes available.

  5. identified May 11, 2026, 11:31 PM UTC

    Twilio customers may be experiencing voice call audio quality degradation between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 8 hours or as soon as more information becomes available.

  6. monitoring May 11, 2026, 11:43 PM UTC

    We have observed a recovery in voice calls between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 2 hours or as soon as more information becomes available.

  7. monitoring May 12, 2026, 01:49 AM UTC

    We have observed a recovery in voice calls between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 4 hours or as soon as more information becomes available.

  8. monitoring May 12, 2026, 05:55 AM UTC

    We have observed a recovery in voice calls between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 8 hours or as soon as more information becomes available.

  9. monitoring May 12, 2026, 01:55 PM UTC

    We have observed a recovery in voice calls between a subset of Twilio United States Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 16 hours or as soon as more information becomes available.

  10. identified May 12, 2026, 03:58 PM UTC

    Twilio customers may be experiencing voice call audio quality degradation between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 1 hour or as soon as more information becomes available.

  11. monitoring May 12, 2026, 04:58 PM UTC

    We have observed a recovery in voice calls between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 2 hours or as soon as more information becomes available.

  12. monitoring May 12, 2026, 06:59 PM UTC

    We have observed a recovery in voice calls between a subset of Twilio United States Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 4 hours or as soon as more information becomes available.

  13. monitoring May 12, 2026, 11:00 PM UTC

    We have observed a recovery in voice calls between a subset of Twilio United States Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 8 hours or as soon as more information becomes available.

  14. monitoring May 13, 2026, 07:00 AM UTC

    We have observed a recovery in voice calls between a subset of Twilio United States Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 16 hours or as soon as more information becomes available.

  15. resolved May 13, 2026, 09:11 PM UTC

    The incident has been resolved and voice calls between a subset of Twilio United States Phone Numbers and T-Mobile network subscribers in the United States are operating normally.